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| year | consumption | change |
| 1986 | 6.90 | NA |
| 1987 | 7.20 | 4.35% |
| 1988 | 7.20 | 0.00% |
| 1989 | 7.20 | 0.00% |
| 1990 | 8.00 | 11.11% |
| 1991 | 8.00 | 0.00% |
| 1992 | 7.30 | -8.75% |
| 1993 | 5.40 | -26.03% |
| 1994 | 6.90 | 27.78% |
| 1995 | 7.30 | 5.80% |
| 1996 | 6.50 | -10.96% |
| 1997 | 6.50 | 0.00% |
| 1998 | 6.50 | 0.00% |
| 1999 | 5.50 | -15.38% |
| 2000 | 6.10 | 10.91% |
| 2001 | 6.50 | 6.56% |
| 2002 | 5.50 | -15.38% |
| 2003 | 5.70 | 3.64% |
| 2004 | 6.60 | 15.79% |
| 2005 | 6.80 | 3.03% |
| 2006 | 6.70 | -1.47% |
| 2007 | 9.00 | 34.33% |
| 2008 | 8.80 | -2.22% |
| 2009 | 9.50 | 7.95% |
| 2010 | 8.00 | -15.79% |
| 2011 | 8.30 | 3.75% |
| 2012 | 8.70 | 4.82% |
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